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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd8b159ef4d9cda628c042f88bd2f0a60f5204278c22ab76764915e04f093f8' 
  AND token = '1gkcyTsBO0vcHIrlMfvLs6YuLlPotqSy88ZDKpnbBqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}